Thunderstorm asthma: what causes it and why is it so dangerous? – video explainer

A mass asthma event which has so far caused the deaths of four people, left dozens in hospital and affected hundreds more hit in Melbourne, Australia, this week. It was triggered by extreme winds and air moisture which broke pollen particles into small enough pieces to enter people’s lungs. Christine Jenkins, clinical professor at the George Institute, explains the phenomenon and why it is especially dangerous for people who do not usually experience asthma